I just built my machine last night. I did not lap. Scythe ninja heat sink. 36c idle 47 load. At 3.2g, 48 idle, 60 load. 12005 3dmark score.
As for games in vista 64... Beautiful. No problems so far. Even older games are running well. There are also a few fixes for 64bit at MS website, cant remember where. They address frame rates etc. You will find a few issues, but nothing you would not expect with a new OS. I have a Roeswill card reader, that is just not working. And Mcafee is stubborn as well, to the point of not installing. Thats about it though. Oh, yea, you will have some trouble running Core temp, but there are some fixes.